Do you have to pull the fly wheel off to replace the chain? I just ordered all my top end parts and didn't even think of that. Has anybody had a chain come apart? I have the manual chain tensioner so I can take any slack out.

I am in the prosess of rebuilding the top end on my 06 crf450 and I am installing a stage 2 cam and was wondering if Im going to have to rejet with this cam. The bike is all stock with a TI 4 muffler and stock head pipe. Jetting is stock right now and ran fine.